| Value | Category | Cases | |
|---|---|---|---|
| 1 | less than a month | 181 |
46.9%
|
| 2 | 1-2 months | 171 |
44.3%
|
| 3 | 2-3 months | 27 |
7%
|
| 4 | more than 3 months | 7 |
1.8%
|
| Sysmiss | 1117 |